Package geogrid. August 19, 2018

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1 Package geogrid August 19, 2018 Title Turn Geospatial Polygons into Regular or Hexagonal Grids Version Turn irregular polygons (such as geographical regions) into regular or hexagonal grids. This package enables the generation of regular (square) and hexagonal grids through the package 'sp' and then assigns the content of the existing polygons to the new grid using the Hungarian algorithm, Kuhn (1955) (<doi: / _2>). This prevents the need for manual generation of hexagonal grids or regular grids that are supposed to reflect existing geography. Imports methods, sp, sf, rgeos, Rcpp License MIT + file LICENSE Encoding UTF-8 LazyData true LinkingTo Rcpp, RcppArmadillo Suggests testthat, covr, lintr RoxygenNote URL BugReports NeedsCompilation yes Author Joseph Bailey [aut, cre], Ryan Hafen [ctb], Lars Simon Zehnder [ctb] (RcppArmadillo implmentation of Munkres' Assignment Algorithm) Maintainer ORPHANED Repository CRAN Date/Publication :51:30 UTC X-CRAN-Original-Maintainer Joseph Bailey <jbailey@futurecities.catapult.org.uk> X-CRAN-Comment Orphaned and corrected on as check problems were not corrected despite reminders. 1

2 2 assign_polygons R topics documented: assign_polygons calculate_cell_size calculate_grid geogrid get_shape_details get_shape_details_internal hungariansafe_cc hungarian_cc plot.geogrid read_polygons Index 9 assign_polygons Assign the polygons in the original spatial data to their new location. Assigns each polygon in the original file to a new location in the gridded geometry using the Hungarian algorithm. assign_polygons(shape, new_polygons) shape new_polygons A "geogrid" object returned from calculate_grid. Value A SpatialPolygonsDataFrame. Examples ## Not run: input_file <- system.file("extdata", "london_la.json", package = "geogrid") original_shapes <- read_polygons(input_file) # calculate grid new_cells <- calculate_grid(shape = original_shapes, grid_type = "hexagonal", seed = 1) plot(new_cells) #

3 calculate_cell_size 3 grid_shapes <- assign_polygons(original_shapes, new_cells) par(mfrow=c(1, 2)) sp::plot(original_shapes) sp::plot(grid_shapes) # look at different grids using different seeds par(mfrow=c(2, 3), mar = c(0, 0, 2, 0)) for (i in 1:6) { new_cells <- calculate_grid(shape = original_shapes, grid_type = "hexagonal", seed = i) plot(new_cells, main = paste("seed", i, sep=" ")) } ## End(Not run) calculate_cell_size Calculate size of grid items (deprecated). Given an input multipolgyon spatial data frame this function calculates the required cell size of a regular or hexagonal grid. calculate_cell_size(shape, shape_details = NULL, learning_rate = 0.03, grid_type = c("hexagonal", "regular"), seed = NULL, verbose = FALSE) shape shape_details learning_rate grid_type seed verbose deprecated. The rate at which the gradient descent finds the optimum cellsize to ensure that your gridded points fit within the outer boundary of the input polygons. Either "hexagonal" for a hexagonal grid (default) or "regular" for a regular grid. An optional random seed integer to be used for the grid calculation algorithm. A logical indicating whether messages should be printed as the algorithm iterates.

4 4 calculate_grid calculate_grid Calculate grid from spatial polygons. Given an input multipolgyon spatial data frame this function calculates a hexagonal or regular grid that strives to preserve the original geography. calculate_grid(shape, learning_rate = 0.03, grid_type = c("hexagonal", "regular"), seed = NULL, verbose = FALSE) shape learning_rate grid_type seed verbose The rate at which the gradient descent finds the optimum cellsize to ensure that your gridded points fit within the outer boundary of the input polygons. Either "hexagonal" for a hexagonal grid (default) or "regular" for a regular grid. An optional random seed integer to be used for the grid calculation algorithm. A logical indicating whether messages should be printed as the algorithm iterates. Examples ## Not run: input_file <- system.file("extdata", "london_la.json", package = "geogrid") original_shapes <- read_polygons(input_file) # calculate grid new_cells <- calculate_grid(shape = original_shapes, grid_type = "hexagonal", seed = 1) plot(new_cells) # grid_shapes <- assign_polygons(original_shapes, new_cells) par(mfrow=c(1, 2)) sp::plot(original_shapes) sp::plot(grid_shapes) # look at different grids using different seeds par(mfrow=c(2, 3), mar = c(0, 0, 2, 0)) for (i in 1:6) { new_cells <- calculate_grid(shape = original_shapes, grid_type = "hexagonal", seed = i) plot(new_cells, main = paste("seed", i, sep=" ")) } ## End(Not run)

5 geogrid 5 geogrid geogrid Turn irregular polygons (such as geographical regions) into regular grids. Author(s) Joseph Bailey <jbailey@futurecities.catapult.org.uk> Examples ## Not run: input_file <- system.file("extdata", "london_la.json", package = "geogrid") original_shapes <- read_polygons(input_file) # calculate grid new_cells <- calculate_grid(shape = original_shapes, grid_type = "hexagonal", seed = 1) plot(new_cells) # grid_shapes <- assign_polygons(original_shapes, new_cells) par(mfrow=c(1, 2)) sp::plot(original_shapes) sp::plot(grid_shapes) # look at different grids using different seeds par(mfrow=c(2, 3), mar = c(0, 0, 2, 0)) for (i in 1:6) { new_cells <- calculate_grid(shape = original_shapes, grid_type = "hexagonal", seed = i) plot(new_cells, main = paste("seed", i, sep=" ")) } ## End(Not run) get_shape_details Extract details from provided polygons (deprecated). Extract spatial extent, range and other geospatial features from the output of read_polygons. Items are returned as a list for use in calculate_grid. get_shape_details(input_shape)

6 6 hungariansafe_cc input_shape get_shape_details_internal Extract details from provided polygons. Extract spatial extent, range and other geospatial features from the output of read_polygons. Items are returned as a list for use in calculate_grid. get_shape_details_internal(input_shape) input_shape hungariansafe_cc hungariansafe_cc hungariansafe_cc hungariansafe_cc(cost) cost cost matrix

7 hungarian_cc 7 hungarian_cc hungarian_cc hungarian_cc hungarian_cc(cost) cost cost matrix plot.geogrid Plot a "geogrid" object Plot a "geogrid" object ## S3 method for class 'geogrid' plot(x, y,...) x An object of class "geogrid" to plot. y ignored... Additional parameters passed to the "sp" package s plot method.

8 8 read_polygons read_polygons Import spatial data. Simple function to read spatial data into a SpatialPolygonsDataFrame. Based on st_read from package sf. read_polygons(file) file A file path pointing to a shapefile or GeoJSON file, or a character string holding GeoJSON data. See the dsn argument of st_read for more details.

9 Index assign_polygons, 2 calculate_cell_size, 3 calculate_grid, 2, 4, 5, 6 geogrid, 5 geogrid-package (geogrid), 5 get_shape_details, 5 get_shape_details_internal, 6 hungarian_cc, 7 hungariansafe_cc, 6 plot.geogrid, 7 read_polygons, 8 st_read, 8 9

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